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sub- (Latin: under, below [suc-, suf-, sug-, sum-, sup-, sur-, sus-]; used as a prefix).

 Don't confuse the sur- in this element with the sur- in super-. Note: sub- regularly means "under", but it often changes its form as it retains its meaning:

subaquatic:
subaqueous:
subarctic:
subatomic:
subaudition:
subboreal:
subcelestial:
subcellar:
subclavian:
subcompact:
subconscious:
subcontinent:
subcontract:
subcutaneous:
subcutical:
subcuticula:
subcuticular:
subcutis:
subdermal:
subdivide:
subdivision:
subdorsal:
subduction:
subdue:
subepiglottic:
subglossal:
subject:
subjection:
subjective:
subjectivity:
subjugate:
subjunctive:
sublet:
sublimate:
sublime:
subliminal:
sublingua:
sublingual:
sublunar:
submarine:
submariner:
submation:
submerge:
submergence:
submergible:
submerse:
submersible:
submersion:
submicroscopic:
submission:
submissive:
submit:
subnormal:
suboral:
suborbital:
subordinate:
subordination:
subphylum:
subscribe:
subscriber:
subscript:
subscription:
subsequence:
subsequent:
subservience:
subservient:
subside:
subsidence:
subsidiary:
subsidize:
subsidy:
subsist:
subsistence:
subsistent:
subsoil:
subsonic:
substance:
substandard:
substantial:
substantiality:
substantiate:
substellar:
substitute:
substitution:
substitutional:
substrata:
substratosphere:
substratum:
substructure:
subsurface:
subtenant:
subterfuge:
subterraneal:
subterranean:
subterraneous:
subtle:
subtlety:
subtonic:
subtotal:
subtract:
subtraction:
subtractive:
subtrahend:
subtropic:
subtropical:
suburb:
suburban:
suburbanite:
suburbia:
subversion:
subversive:
subvert,

Usually sub- becomes suc- before c:

succeed:
success:
succession:
succinct:
succor:
succumb,

Sometimes sub- becomes suf- before f:

suffer:
suffice:
sufficient:
suffix:
suffocate:
suffrage:
suffuse :

Usually sub- becomes sug- before g:

suggest,

Sometimes sub- becomes sum- before m:

summon:
sumptuous,

Sometimes sub- becomes sup- before p:

supplement:
supplicate:
supplicate:
supplicate:
supply:
support:
suppose:
suppress:
suppression,

Sometimes sub- becomes sur- before r:

surrender:
surreptitious:
surrogate,

The prefix, sub- is simplified to su- before sp; before c, p, and t, it is sometimes formed into sus-; as seen in suspect, suspend, suspicion, suspension, sustain, et al.].